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Graphical output of receiver operating characteristic analyses for the colostrum refractive index discriminant ability. The ability to discriminate good- and low-quality colostrum samples was tested considering (a) 50 and (b) 60 g/L of immunoglobulins G as a threshold. Coordinates of the optimal cut-off (●) are specified along with the area under curve (AUC) with 95% confidence interval
